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"It needs to start from scratch" - it's a completely different rating system. If a player loses more than they win, their rating will go into the negative. Isn't that a bit unsightly...? For example, this won't happen with 1000 points.
IMHO - the system I described is more balanced. You give too many points for games played and not enough for the difference in skill level.
In general, I've been following the development of the current rating system from the very beginning. I decided to post my system after discussions about automating rating calculations. Please don't be too harsh.